K-Swiss Run One

Serious runners are going to want to check out K-Swiss's new Run One running shoes that essentially pack two shoes into one. They do this with a technology called "miSOUL" which is an interchangeable insole system that let you swap in different insoles that are tuned to a specific style of running. The Run Ones include two insoles: Light 1.0 for fast days and races and Cushion 1.0 for distance running. Link: $125